Entropy and area.

@article{Srednicki1993EntropyAA,
  title={Entropy and area.},
  author={Srednicki},
  journal={Physical review letters},
  year={1993},
  volume={71 5},
  pages={
          666-669
        }
}
  • Srednicki
  • Published 1993
  • Physics, Medicine
  • Physical review letters
  • The ground-state density matrix for a massless free field is traced over the degrees of freedom residing inside an imaginary sphere; the resulting entropy is shown to be proportional to the area (and not the volume) of the sphere. Possible connections with the physics of black holes are discussed. 

    Figures from this paper.